System for raising and lowering the load support of an electric

Details System for raising and lowering the load support of an electric System for raising and lowering the load support of an electric

1997-03-24

1999-01-26

Richter, Sheldon J.

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

60431, 60477, B66F 920

Patent

active

058626638

ABSTRACT:
In an electric lift truck, an asynchronous electric motor, a reversible sealed pump driven by the motor, communicating with the hydraulic actuators and also with a reservoir, a device which measures the angular position and the angular velocity of the motor, and a control and monitoring unit which causes the motor to be supplied according to the required speed of raising and lowering of the load support and on the basis of data supplied by the measuring device are used for raising and lowering the load support by means of one or more hydraulic actuators. There is a saving of energy in raising; there is also a recovery of energy in lowering, in which the motor acts as a generator to recharge the accumulator batteries of the lift truck.

REFERENCES:
patent: 4723107 (1988-02-01), Schmid
patent: 5097857 (1992-03-01), Mayhew
patent: 5505043 (1996-04-01), Baginski et al.
patent: 5638387 (1997-06-01), Palleggi et al.
patent: 5647208 (1997-07-01), Spitzbarth
patent: 5649422 (1997-07-01), Baginski et al.

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